de gruyter



y 1931- P. J. DE GRUYTER FETAL DOWEL FOR "CODE" BEAIS Filed June 17.1929 Patented May 19, 1931 UNETED STATES eA'rnNT OFFICE IVIETAL DGVIELFOR WOODEN BEAMS Application filed June 1 7, 1929, Serial No. 371,661,

The invention relates to a metal dowel for wooden beams, iavingtriangular fangs placed in groups and projecting from the plane of theplate, each group being made 5 by radial incisions in the plate.

With the known dowels 01" this kind all fangs of each group were eitherbent to one or to the other side of the plate. The drawback of thisconstruction was that such a dowel, when being driven into both beamswhich should be joined by it, had the tendency to corrugate andconsequently was unfit for practical use.

According to the invention the fangsof ieach group are alternatelyprojecting from one from the other side of the plate.

Due to the construction of the fangs the dowel remains absolutelyflatwhen being driven into the beams.

Bending triangular fangs alternately to one and to the other side of theplate is known in itself with plates having fangs which are not arrangedin groups but one next to the other along the edges of the plate. Inorder to obtain a long length of the edges, for making as many fangs aspossible, it is necessary to make indentations in these dowels.

The advantage of the dowels according to the invention over the lastmentioned C011- struction is that no indentations are wanted,

so that it is possible to arrange a larger quantity of fangs per unityof the surface within the periphery of a plate and consequently theforce to be transmitted is increased, whereas there is moreover lesswaste material.

The invention is illustrated in the drawings by some examples.

Figs. 1 and 2 showtwo manners in which the incisions for one group offangs may be made.

Figs. 3 and 4: are a perspective View and a top view of various dowels.

Fig. 5 is a section of a joint of three wooden beams. V

Fig. 6 shows in perspective a group of fangs in their bent position.

These figures need little elucidation.

In Figures 1 and 2 the incisions 1 2 are made in the plate from thepoints 1. The

and in the Netherlands June 20, 1928.

triangular fangs obtained in this way are bent along the baselines 22alternately upward and downward, as illustrated in Figs. 3, 4 and 6.

Fig. 3 shows a square and Fig.4 a hexagonal dowel.

In the first case four, and in the second case six fangs are united intoone group. One of the groups of fangs of the latter sort is illustratedin Fig. 6 on a larger scale. The holes 3 serve for letting pass acentral con necting bolt 4 (see Fig. 5).

I claim A metal dowel for wooden beams comprising a plate having aplurality of groups of triangular fangs projecting from the plane of theplate, each group being formed by means of radial incisions in the'platein such a way that the triangles of each group have a common apexwhereas the base lines form an uninterrupted line, the fangs of eachgroup alternately projecting from each side of the plate. Z

In testimony whereof I afliX my signature.

PAUL J OHAN on GRUYTER.

